Improvement in boiler-tube stoppers



P. WALKER.

Balma-TUBE sToPPEIR. No.17z,528. Patented 53.11.18,'1876.

WITNESSES INVENTUB N. PErERS, PHTo-LITHOGRAPNER. WASHINGTON, u C.

UNITED STATES PATENT OEEIGE.

PETER WALKER, 0F JERSEY CITY, NEW JERSEY.

IMPROVEMENT IN BOILER-TUBE STOPPERS.

Specification forming part of Letters Patent No. 172,528, dated January18, 1876 application filed December 18, 1875.

To all whom it may concern:

Be it known that I, PETER WALKER, ot'

Jersey City, Hudson county, New Jersey, have invented a new and ImprovedTube-Stopper, of which the following is a specitication My inventionconsists of a spring packingring and a clamp for expanding it for eachend of the boiler-tube, the clamps being formed ot' a collar on each endof the tube, and other collars on a rod passing through the tube, andfixed so as to clamp and expand the packingrings tightly into the tubesof' the boiler, the

vrod and tube of the stopper being of suitable and H the nut forscrewing up the collars F. on the rod, and expanding the springs.

It is designed to have the stopper so constructed that, besidesexpanding the face of the springs directly against the tube, the outeredge will be forced out against the ends of the tube, as shown at I, sothat the collars F will squeeze the parts so forced out directlyagainstthe ends of the tube, thus insuring perfectly' steam-tightjoints. A stopper ot' this kind can be put in a locomotive or marineboiler, by the aid of suitable tools, without stopping the tire.

I am aware that boiler-tubes have been stopped by plugs held between twonuts; but

What I claim is- The combination, with boiler-tube A, ot' the tube C,having collar D at each end, and the screw-bolt E, having .collar F ateach end, one of the latter being movable in front ot' a clamping-nut,thc whole to act upon the springs G Gr, in the manner set forth.

PETER WALKER. Witnesses:

T. B. MosHEE, ALEX. F. ROBERTS.

